Palo Alto Networks Security Advisories / CVE-2020-1998

CVE-2020-1998 PAN-OS: Improper SAML SSO authorization of shared local users

047910
Severity 5.4 · MEDIUM
Attack Vector NETWORK
Attack Complexity LOW
Privileges Required LOW
User Interaction NONE
Scope UNCHANGED
Confidentiality Impact LOW
Integrity Impact LOW
Availability Impact NONE

Description

An improper authorization vulnerability in PAN-OS that mistakenly uses the permissions of local linux users instead of the intended SAML permissions of the account when the username is shared for the purposes of SSO authentication. This can result in authentication bypass and unintended resource access for the user.

This issue affects:

PAN-OS 7.1 versions earlier than 7.1.26;

PAN-OS 8.1 versions earlier than 8.1.13;

PAN-OS 9.0 versions earlier than 9.0.6;

PAN-OS 9.1 versions earlier than 9.1.1;

All versions of PAN-OS 8.0.

Product Status

PAN-OS

VersionsAffectedUnaffected
9.1< 9.1.1>= 9.1.1
9.0< 9.0.6>= 9.0.6
8.1< 8.1.13>= 8.1.13
8.08.0.*
7.1< 7.1.26>= 7.1.26

Severity: MEDIUM

CVSSv3.1 Base Score: 5.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N)

Weakness Type

CWE-285 Improper Authorization

Solution

This issue is fixed in PAN-OS 7.1.26, PAN-OS 8.1.13, PAN-OS 9.0.6, PAN-OS 9.1.1, and all later PAN-OS versions.

PAN-OS 8.0 is now end-of-life as of October 31, 2019, and is no longer covered by our Product Security Assurance policies.

Workarounds and Mitigations

The impact of this vulnerability can be mitigated by removing shared usernames between local linux users and SAML enabled users.

Acknowledgments

Palo Alto Networks would like to thank Maurice Lok-Hin for discovering and reporting this issue.

Timeline

Initial publication
© 2020 Palo Alto Networks, Inc. All rights reserved.